I purchased this light from Simon:
https://www.aliexpress.com/item/32873025585.html
Simon indicated during an extended PM exchange that he could not ship ZWB2 filters even as optional, uninstalled add-ons with the order due to patent issues.
The S2 UV arrived yesterday, sans filter of course, & works fine, with very obvious visible output. The installed clear lens measures 20.5mm x 1.6mm.
If anyone had a 20.5mm x 1.5 ~2.0mm ZWB2 filter to fit a Convoy S2 you'd like to sell in CONUS, please let me know via PM. I'd prefer to buy from a known & trusted member as first choice.
Barring that, I'd appreciate advice on where to procure a quality filter, Amazon or trusted eBay CONUS seller preferred, but will entertain buying from China if necessary.
Thanks all.
slmjim